Piston for internal-combustion engines



June 19}, 1923.

J. WOLK PISTON FOR INTERNAL COMBUSTION ENGINES Filed June 8. 1922 FIQZ.

FIG. 11

- v gwvanfoz M 11 0511 Patented June 19, 1923..

stares JOSEPH WOLK, 0F BRIDGEPORT, CONNECTICUT.

PISTON non INTERNAL-GOMBUSTICN nnernns.

Application filed June 8,

To all whom it may concern:

Be it known that I, JOSEPH VVOLK, a citizen of Poland, residing atBridgeport, in the county of Fairfield and State of Connecticut, haveinvented certain new and use ful Improvements in Pistons for Internal-Combustion'Engines, of which. the following is a specification.

This invention relates to certain new and useful improvements in pistonsfor internal combustion engines'and has particular reference to theprovision of means associated with the interior of a hollow pistonto'prevent the formation of carbon upon the bottom face of thepistonhead.

The primary object of the invention resides in the provision of theplate or shield removably supported within a hollow piston in spacedrelation to the head thereof to prevent the oil splashing in the crankcase from being thrown into contact with the bottom face of the pistonhead to eliminate a carbon deposit upon the bot-tom face of the pistonhead.

The invention further embodies in a piston of the type above set forth,the provision of flap-valve controlled openings in the plate or shieldwhich will permit the passage of air in the crank casing to the spacebetween the late or shield and the piston head for partlally cooling thehead and also permitting the drainage of any oil that might enter saidspace.

With these general objects in view and others that will appear as thenature of the invention is better understood, the same consists in thenovel construction, combination and arrangement of parts hereinaftermore fully described, illustrated in the accompanying drawings, andpointed out in the appended claims.

In the drawings forming a part ofthis application and in which likedesignating characters refer to corresponding parts throughout theseveral views:

Figure 1 is a longitudinal sectional view of a piston constructed inaccordance with the present invention showing the guide plates or shieldremovably positioned in teriorly of the piston,

Figure 2 is a cross sectional view taken on line IIII of Figure 1showing the upper side of the two-part guide plate or shield with thedamper valves associated therewith,

Figure 3 is a cross sectional View taken on 1922. Serial No. 566,765.

face of the guide plate or shield, A T Figure 4 1s an edge view of amodified line Iii-4n of Figure 1 showing the lower 1 form of guard plateor shield showing the flat guard positioned upon the upper side thereof,and

F lgure 5 1s a perspective view of one of the sections of the guardplate or shield.

Referring more in deta l to the accom panying drawing, I andparticularly to Figure 1 there is illustrated a piston embodying K aside wall or skirt 1 open at the lower side thereof and closed at theupper end by a flat head 2. Diametrically oppositebearings support atubular bushing't' for the wrist pin 5, while the upper end of thepiston rod 6 is journaled upon the wrist pin and sleeve as clearlyillustrated. i

The inner face of the side wall 1 of the piston carries an inwardlydirected flange 7 spaced from the head 2 of the piston and to the lowerface of which a two-part guardv plate or shield is removably secured.The

shield embodies two semi-circular plate members 8 having the meetingedges thereof overlapping as at 9 while the outer edges thereof arereniovably secured by bolts 10 i to the lower face of the flange 7, theshield forming an air space 11 between the same and the head 2 of thepiston as clearly shown in Figure 1. Each section 6 of the shield isprovided with an opening 12 which is closed at the lower side thereof bya flap valve 13 secured as at 14 to said shield.

In the operation of the device, the piston reciprocating in an enginecylinder will have the bearing parts thereof lubricated by the oilsplashing upwardly from the crank case,

the splashing oil contacting the shield and being prevented fromentering the air space between the shield and the head of the piston. Onthe upward stroke of the piston, the flat valves 13 will be partiallyopened, allowing the air in the crank case to pass through the openings12 and into the air space 11 for the purpose of cooling the head 2,downward movement of the piston causing the flat valves 18 to close theopenings 12 and preventing the passing of oil to said openings forcontact with the highly heated piston head. In this manner, the oil ispre vented from being thrown into contact with the bottom face of thehead of the piston which will completely eliminate the formation ofcarbon thereon, the shield further providing an air space which willtend to lower the temperature of the piston head and also assist in theelimination of a carbon deposit upon the upper face of said head.

In the form of invention shown in Figure 4, the guard plate sections 8are provided with openings 12 and angle plates 13 mounted upon the upperfaces ofthe shieldsec-tions overlie the openings 12 to permitlthe free,

ous forms, modifications and arrangements of the parts may be madewithout departing from the spirit and scope'of the invention as claimed.

Having thus "fully described the invention, What 1' claim as new is 1.Ina piston of the type described embodying a side skirt and an upperhead, an inwardly directed annular flange carried by the inner i ace'ofthe side skirt, a shield secured to said flange forming an air spacebetween said flange and piston head, said shield being formed ofsemi-circular sections removably secured to said flange with theadjacent edges thereof overlapping.

2. In a piston of the typedescribed embodying a side skirt and an upperhead, an inwardly directed annular flange carried by the inner "face ofthe side skirt, a shield secured to said flange forming an air spacebetween said flange and piston head, said shield being formed ofsemi-circular sections removably secured to said flange with theadjacentedges thereof overlapping, each section having an opening therein and aflap.

valve associated with each opening;

ln testimony whereof I affix my signature.

JOSEPH WOLK.

